content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
   * Other names may be trademarks of their respective owners.]
   *
   * -----------------------
   * DatasetChangeEvent.java
   * -----------------------
   * (C) Copyright 2000-2008, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes (from 24-Aug-2001)
   * --------------------------
   * 24-Aug-2001 : Added standard source header. Fixed DOS encoding problem (DG);
   * 15-Oct-2001 : Move to new package (com.jrefinery.data.*) (DG);
   * 22-Oct-2001 : Renamed DataSource.java --> Dataset.java etc. (DG);
   * 11-Jun-2002 : Separated the event source from the dataset to cover the case
   *               where the dataset is changed to null in the Plot class.
   *               Updated Javadocs (DG);
   * 04-Oct-2002 : Fixed errors reported by Checkstyle (DG);
   * 05-Oct-2004 : Minor Javadoc updates (DG);
   *
   */
  
  package org.jfree.data.general;
  
  /**
   * A change event that encapsulates information about a change to a dataset.
   */
  public class DatasetChangeEvent extends java.util.EventObject {
  
      /**
       * The dataset that generated the change event.
       */
      private Dataset dataset;
  
      /**
       * Constructs a new event.  The source is either the dataset or the
       * {@link org.jfree.chart.plot.Plot} class.  The dataset can be
       * <code>null</code> (in this case the source will be the
       * {@link org.jfree.chart.plot.Plot} class).
       *
       * @param source  the source of the event.
       * @param dataset  the dataset that generated the event (<code>null</code>
       *                 permitted).
       */
      public DatasetChangeEvent(Object source, Dataset dataset) {
          super(source);
          this.dataset = dataset;
      }
  
      /**
       * Returns the dataset that generated the event.  Note that the dataset
       * may be <code>null</code> since adding a <code>null</code> dataset to a
       * plot will generated a change event.
       *
       * @return The dataset (possibly <code>null</code>).
       */
      public Dataset getDataset() {
          return this.dataset;
      }
  
  }
  